| Case Name |
The scaffold overturned and fell, when the scaffold for the work was pushed. |
| Pictograph |
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| Date |
February 23, 1999 |
| Place |
Aira District Hayato town in Kagoshima Prefecture |
| Location |
The construction site of signboard backing and shutter installation in the commercial store roof |
| Overview |
The scaffold for the work was pushed while two workers were on it in order to carry out the installation of shutter receiver (truss) and signboard backing of the commercial store roof. Then, the scaffold lost balance and fell down. Two workers on it fell down to the ground, and a worker under the scaffold was caught in the scaffold. |
| Incident |
On 23rd February, 1999, at about 18:00, the two sets of the transfer platform ( the thing which has the wheel and 3 layers; the height was 5.3m, width was 3.65m and 2 span)were put facing each other, and they started to install the shutter receiver(truss) by using the scallffold for the work which the steel cloth frame was set in the interval.
In order to carry out the mounting of the 4th truss, when 2 workers pushed the downward part in the scaffold for the work with 2 workers on it, it completely lost its balance, overturned and collapsed.The 2 workers on the top of it, fell down to the ground and the worker who had pushed it down below caught in the scalffold and got injured. |
| Sequence |
* 2 workers pushed the scaffold down below for the work while other two workers were on it.
* In collapsing, a balance of the whole scaffold for the work overturned.
* The 2 workers, who had ridden on it, fell down.
* One worker was caught in the scaffold for the work who had pushed down below it. |
| Cause |
* It Overturned only by a little pushing, because it was a scaffold for the work of the unstable structure that the two scaffolds of the three-layer structure were combined.
* The scaffold was turned over ,lacking a balance because a few people moved it by force.
* The work period had been limited, so the site deputy of the general contractor didn' t examine the sufficient safe construction work method and he neglected the preparation for the work,and he didn' t indicate the accurate workmanship instruction.
* No handrail at the top of the scaffold, and there was neither the going up and down facility. The display of the maximum authorized payload wasn' t there. |
| Countermeasures |
* This scaffold is considered as a transfer scaffold in law. They should examine the safe work method, make an accurate work plan and determine the safe work method.
* In the case of the using a scaffold with wheels, for the prevention of tipping over, they should be assembled as having a good balance and be fixed with duplicates, etc. so as not to move suddenly. And, as for the construction frame, they should adopt the structure determined in the structural code and set the display of the maximum authorized payload, handrails, and going up and down facility.
* Not to move the scaffold with workers on the work floor.And, it is also important to examine beforehand and have the workers know the method of how to move the scaffold.
* The field deputy of the subcontract and the foreman of contractor should have high consciousness and do the safety education for the workers thoroughly. |
| Knowledge Comment |
* The transfer scaffold should be assembled in the right way and they should work in a safe working way at all times !
* A general contractor and a subcontractor should have the high consciousness in terms of the safety and see to it that safety education is carried out without exceptionthe to the workers ! |
| Background |
* In the background of this accident, there was the circumstance which they had adopted the portable scaffold with the unstable structure.
In the original plan, as a method to install the shutter receiver (truss), it should have been done to lift up the truss by a loading type truck crane one by one, put the welded L-type steel beam temporarily on the roof directly and weld it after setting the transfer platform at the point of welding, and welding the L-type steel at first.
However, the roof was unnecessary, and it didn't go in the working plan. After all they had assembled the scalffold for the work against their will.
Moreover, it became night, they tried to save time, and against their will, they had assembled the scaffold for the work which was an unstable structure in hurry. In addition, it collapsed, because wokers persons who hurried up the work, pushed the scaffold impossibly, so a balance of the scaffold overturned, and it can be said that it was reasonable consequence. |
| Sequel |
* For the slipshod safety management situation, it became a subject to administrative disposition. |
| Reason for Adding to DB |
* Many various types pf accidents like this case in the short period have happened, and it is necessary to be thtough the basic safety countermeasure. |
| Scenario |
| Primary Scenario
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Misjudgment, Misunderstanding, Ignorance of Procedure, Disregard of Procedure, Ignorance, Insufficient Knowledge, Organizational Problems, Poor Management, Organizational Problems, Inflexible Management Structure, Poor Value Perception, Poor Safety Awareness, Regular Operation, Nonobservance of Procedure, Regular Movement, Dangerous Movement, Production, Hardware Production, Failure, Fracture/Damage, Bodily Harm, Harm to Physical Well-being, Bodily Harm, Injury
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| Sources |
* Safety and health information center ( the labor accident case )
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| Number of Deaths |
0 |
| Number of Injuries |
3 |
| Physical Damage |
The scaffold for the work, etc. |
| Financial Cost |
Unknown |
| Economic Loss |
Unknown |
| Consequences |
The following are brought about:Generality sense of unease for the slipshod safety management situation and the loss of the confidence and damage to the image of the construction industry. |
| Field |
Civil Engineering
|
| Author |
KANO, Koji (Japan Construction Safety and Health Association)
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